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Xanthene dye complexes

  • US 4,924,009 A
  • Filed: 06/03/1987
  • Issued: 05/08/1990
  • Est. Priority Date: 06/03/1987
  • Status: Expired due to Fees
First Claim
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1. An ionically bonded compound of the formula (I)


  • space="preserve" listing-type="equation">X.sup.-n [Y.sup. ].sub.n (I)
wherein X represents an anionic xanthene dye and Y represents a gegen ion selected from the group consisting of sulfonium, phosphonium, iodonium, pyrylium, hydrazinium and hydrazide ions and n is 1 or 2.

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